JPH0762485B2 - Stick anchor device - Google Patents

Abstract

PCT No. PCT/EP90/01132 Sec. 371 Date Dec. 4, 1991 Sec. 102(e) Date Dec. 4, 1991 PCT Filed Jun. 25, 1990 PCT Pub. No. WO91/00433 PCT Pub. Date Jan. 10, 1991.The invention relates to a bar anchor arrangement for bars subject to tensile stress, whereby the bar anchor (1) consists of an anchor body with a bore provided with an internal thread (5) for screwing in a tension bar (8) provided with an external thread (9) as well as of two parallel eye plates (3) adjoining the anchor body to accomodate an eye bar (10). A smooth tolerance compensating section (6 and 7) is provided on at least one side of the internal thread (5). The length of the external thread (9) of the tension bar (8) essentially corresponds to the minimum screw-in length of the tension bar plus the length of a tolerance compensating section. The length of the internal thread (5) is greater than the minimum screw-in length of the tension bar.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides two eyes parallel to each other having a female threaded hole for screwing a male threaded drawbar and connected to an anchor body and for receiving an eye rod. A rod anchoring device for a rod under tension, comprising an anchor body with a plate.

Such rod anchor devices have been known for a long time.

The problem with this arrangement is that it is always necessary to ensure that the pull rod is screwed into the internal thread of the rod anchor anyway to the minimum screw-in length.

We tried to solve this with the following structure. That is, the rod anchor main body was provided with a control hole arranged perpendicularly to the longitudinal axis, and this control hole was able to secure the prescribed minimum screwing length of the pull rod in the internal thread of the pull anchor. This arrangement German utility model 87 07 29
3 shows.

This solution by the applicant and the inventor has already been used successfully in construction work (Bieberach Vocational School), but this solution does not seem to be entirely satisfactory. Even when the edge region of the control hole is strengthened by the collar, the control hole always causes an undesired weakening of the cross section.

In addition, such control holes have a poor appearance with collar-like reinforcements. Moreover, the control hole could not secure a tolerance range.

The problem on which the invention is based is to create a rod anchoring device of the type mentioned at the outset, in which case it is ensured that the required minimum screw-in length is protected in any case. In addition, the minimum screw-in length must be ensured with positive or negative tolerances anyway.

This is achieved according to the invention by the features of claim 1.

Further features of the invention can be found in the dependent claims.

The present invention will now be described in detail by way of examples with reference to the accompanying drawings.

In the figure, Fig. 1a schematically shows a plan view of a rod anchor with a pull rod according to the invention.

FIG. 1b schematically shows a plan view of the part of the pull rod.

FIG. 2 shows a cross sectional view of a rod anchor device according to the present invention.

FIG. 1a shows a rod anchor 1 having an anchor body 2 to which two eye plates 3 are connected, into which eye bolts 4 shown in FIG. 2 can be inserted. Is. The rod anchor 2 is
It has a hole in which the female screw 5 is provided. We still have to talk about the dimensions of this internal thread.

A screw tolerance compensating portion 6 having a smooth inner peripheral surface is provided at the outer end of the hole. In particular, the other side of the female thread is provided with another screw tolerance compensating portion 7, as can be seen in FIG.

The pull rod 8 has a male screw 9 in the female screw 5 in the hole of the rod anchor 2.
Can be screwed in. In this connection, it is recognized that these pull rods have a turnbuckle characteristic, i.e. each is provided with a right-hand thread at one end and a left-hand thread at the other end, not shown. Let's do it.
Then, this also applies to bar anchors with right or left internal thread. As can be seen from FIG. 2, an eye rod 10 can be inserted between the two eye plates 3, which eye rod is then held by the eye bolt 4. Further, the eyebolt 4 is prevented from slipping out of the inside by the Zeger circlip ring 11.

The dimensions of the individual screws are then of particular importance.

Finally, FIGS. 1a and 1b show yet another groove 12, which is provided in particular on two sides facing the drawbar, which makes it easier to screw the drawbar into the bar anchor.

In the field of civil engineering and construction, the actual size often changes from the set size. This is especially true for linear dimensions. In addition, if the pull rod is long, the length must be taken into consideration when the temperature changes. In that case, the length dimension can be adjusted by turning the pull rod 8 screwed into the rod anchor 2 by its turnbuckle characteristic. In designing the rod anchor device, the dimensions of the individual screws and screw tolerance compensating parts are selected as follows. That is, when the drawbar 8 is screwed in such that the screw can no longer be seen, the drawbar 8 causes the internal thread 5 of the bar anchor 2 to
Select to reach the minimum screw-in length of the male thread 9 into the. In other words, the length of the male screw 9 of the pull rod 8 and the length of the female screw 5 of the rod anchor 2 are determined by the screw allowable range compensation portion 6.
Corresponds to the value obtained by adding the length of to the minimum screw-in length. Therefore, it is possible to always compensate for the constant minimum screw-in length without taking the minimum screw-in length required for safety into consideration, while taking this screw length into consideration. This also applies when the drawbar 8 is screwed deep enough to enter the thread tolerance compensation part 7 behind the internal thread 5 of the rod anchor 2. Thus, according to the thread tolerance compensating part both before the internal thread of the rod anchor and after the internal thread, when the pull rod is screwed from the outside so that its thread part cannot be seen, It is always ensured that the threading depth required for the safety of the threads of the threaded helix is reached. Moreover, it is aesthetic because you cannot see the exposed screws.

The remaining dimensions of the new rod anchor device are also of essential importance. If the cross section of the pull rod 8 is chosen with its diameter D as a unit reference, the eye plate has the following dimensions:
The material thickness d1 of the eye plate in the direction of the tensile load corresponds approximately to the diameter D of the pull rod. Perpendicular to the eye plater,
The material thickness d2 of the eye plate in the direction going through the midpoint of the eyebolt corresponds to approximately 0.74 times the diameter of the pull rod. The width d3 at the transition from the eye plate 3 to the anchor body is measured at an angle of 45 ° to the longitudinal axis,
It corresponds to about 1.04 times the diameter of the pull rod. The same dimension exists from the end of dimension d3 as dimension d4 perpendicular to the longitudinal axis.

The cross-sectional dimension of the eye plate 3 around the eye bolt 4 is d5
And corresponds to approximately 0.5 times the diameter D of the pull rod.
This dimension is reduced to d6 on each side of the eyebolt, approximately 0.4 times the diameter of the drawbar, respectively.

The eye of the flat rod, the eye rod 10, has the same radial dimensions d1, d2, d3 and d4 as the eye plate of the rod anchor.

This rod anchoring device according to the invention can be considered as a whole arrangement and must be applied and used only in the indicated size ratios. This is because these dimensions, which are fully ascertained by calculation and experimentation, are optimal for shaping, material utilization, easy assembly and easy disassembly. Therefore,
No deviation should occur in any case.

Thus, the new rod anchor device can be installed and removed with little manual effort, and the minimum required thread length can be easily and effectively monitored by the inability to see the thread pitch.

In particular, the external thread 9 is rolled into a drawbar, which contributes significantly to the safety of the thread and to the strength of the overall bar anchor device. At the same time, the problems to be solved by the present invention are explicitly solved.

Claims (8)

[Claims] 1. A rod anchor (1) having an anchor body (2) with a hole having an internal thread (5) and two parallel rods connected to the anchor body (2) and for receiving an eye rod (10). Three ali plates (3),
And a male rod (9) provided and a pull rod which can be screwed into the female screw (5) of the hole, for a rod under tension, wherein the hole of the anchor body (2) is smooth. A first screw allowable range compensating portion (6) having an inner peripheral surface, a female screw (5) connected to the same, and a second screw allowable range compensating portion having a smooth inner peripheral surface connected to the female screw. (7), wherein both screw tolerance compensating parts (6, 7) have an inner diameter slightly larger than the outer diameter of the male thread (9) of the drawbar, and the male thread (9) of the drawbar (8). ) Is substantially the same as the length of the screw tolerance compensating portion (6 or 7) added to the minimum threaded length of the pull rod (8). 2. A rod anchor device according to claim 1, characterized in that the length of the internal thread (5) is greater than the minimum threaded length of the pull rod. 3. The rod anchor device according to claim 1, wherein the diameter of the openings of the parallel eye plates is approximately 0.85 times larger than the diameter (D) of the pull rod. 4. The material thickness (d1) of the eye plate in the direction of the tensile load substantially corresponds to the diameter (D) of the pull rod, and the width (in the direction perpendicular to the pull rod and passing through the midpoint of the opening ( d2) corresponds to approximately 0.74 times the diameter of the drawbar and the width (d3) at the transition of the eye plate (3) of the anchor body is measured at an angle of 45 ° to the longitudinal axis and The vertical direction (d4) is about 1. of the diameter (D) of each pull rod.
The rod anchor device according to any one of claims 1 to 3, which corresponds to 04 times. 5. The material thickness (d5) of the eye plate around the opening provided for the eye-votes (4) corresponds respectively to approximately 0.5 times the diameter of the pull rod and towards both sides in the longitudinal direction. The rod anchor device according to any one of claims 1 to 4, characterized in that the diameter is reduced to approximately 0.4 times (d6) each of the diameters of the pull rods. 6. An eye rod (10) held by an eye bolt (4), the eye of the eye rod having the same radial dimension (d1, d2, d3, d4) as the eye plate of the rod anchor.
The rod anchor device according to any one of claims 1 to 5, further comprising: 7. The rod anchor device according to claim 1, wherein the external thread of the pull rod is rolled. 8. A rod anchoring device according to claim 1, characterized in that the pull rod has at least one flat stamping surface (12) on at least one side, in particular two stamping surfaces facing each other.